The independent role of morphology in mate choice is revealed by the rare instances where the usual association between song and morphology is disrupted.
More Quotes from Peter R. Grant:
To summarize, the particular song a male sings, and the behavioral responses of females to song and morphological signals, are not genetically inherited in a fixed manner but are determined by learning early in life.Peter R. Grant
Males transmit signals in courtship through behavioral displays.
Peter R. Grant
We observe closely related species in sympatry and infer how they evolved from a common ancestor.
Peter R. Grant
Thus the genetic basis to the origin of bird species is to be sought in the inheritance of adult traits that are subject to natural and sexual selection.
Peter R. Grant
The theory of founder effects does not explain how novel features like plumage traits arise.
Peter R. Grant
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